BoilerFaultCodesPotterton Neon7 Fault Code
Also written as NEON7 — same fault.
The Potterton Neon7 fault code means: your boiler has detected that there is not enough water pressure or the water is not moving through the system properly.. It appears on 1 Potterton model in our database.
Technical description: Fault on Pump or Low System Pressure
What causes the Potterton Neon7 fault?
This fault occurs when the boiler's internal sensors detect that water isn't circulating at the correct speed or pressure to safely carry heat away from the burner. The most common reasons are a drop in system pressure due to a minor leak, or a mechanical failure where the pump has seized or worn out over time.
This issue often surfaces in autumn when the heating is turned back on after summer, as pump components can seize during long periods of inactivity.
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the filling loop valves to top the system up with more water.Check if any radiator valves are fully closed or if there is a blockage in the system pipes.
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Gas Safe Register →Potterton models that show the Neon7 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Neon7 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026